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Effect of rib height on turbulent flow and heat transfer of kerosene in rectangular duct

Acta Mechanica Sinica 2022年第7期38卷 97-108,I0002页

作者： Xian Li Fengquan Zhong Yunfei Xing State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing100190China School of Engineering Science University of Chinese Academy of SciencesBeijing100049China

The coupling effects of rib heights and fluid properties on turbulent convective heat transfer of kerosene flow through the rectangular duct on the ribbed bottom wall are studied numerically in this *** numerical simulation is based on the ten components surrogate model of kerosene and the Reynolds average method combined with the re-normalized group(RNG)k-εturbulence *** turbulent vortex structures and heat transfer characteristics of kerosene flowing over rectangular ribs of different heights are *** results show that three dimensional vortices are generated by the ribs,and the vortices alter local flow significantly,leading to both enhanced and reduced convective heat transfer at different locations near the *** addition,it is found that with the increase of rib height,the average Nusselt number and the wall friction factor on the ribbed wall also *** the present study,the maximum heat transfer enhancement rate of kerosene flow is 72.16%,and the ratio of rib-to-duct height is 0.75.

关键词： rib height Kerosene Heat transfer enhancement Turbulent flow

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Experimental research on bond strength of deformed GFRP rebars with different surface configurations

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Journal of Harbin Institute of Technology(New Series) 2009年第4期16卷 469-474页

作者：郝庆多王言磊欧进萍 Harbin Quality Supervising Central Station of Construction Engineering School of Civil Engineering Harbin Institute of Technology School of Civil and Hydraulic Engineering Dalian University of Technology

Based on the Canadian Standards Association(CSA) criterion,experiments on 30 pull-out specimens were conducted to study the bond strength of deformed GFRP rebars with 8 different surface *** rebar was embedded in a 150 mm concrete cube,and the test embedded length was four times of the rebar *** between the mode of failure,the average bond strength and the average bond strength-slip for each rebar was *** show that the failure mode of all specimens is the shearing off or desquamation of ribs,no splitting cracks appear on the cube *** bond stress of deformed GFRP rebars mainly depends on the mechanical interaction between the ribs of the bar and the surrounding concrete,and the bond strength of deformed GFRP rebars is improved *** optimal rib spacing is less than 2.5 times of the rebar diameter,and the rib height is more than 3% of the rebar diameter.

关键词： deformed GFRP rebars concrete bond strength pull-out test rib spacing rib height optimalsurface configuration

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